|Test site||NTS Area 12, Rainier Mesa; NTS Area 19, 20, Pahute Mesa; NTS, Areas 1-4, 6-10, Yucca Flat|
|Number of tests||13|
|Test type||ug shaft, ug tunnel|
|Max. yield||150 kilotonnes of TNT (630 TJ)|
|Previous test series||Operation Musketeer (Nuclear test)|
|Next test series||Operation Cornerstone|
Operation Touchstone was a series of 13 nuclear tests conducted by the United States in 1987-1988 at the Nevada Test Site. These tests followed the Operation Musketeer (Nuclear test) series and preceded the Operation Cornerstone series.
The United States test series summary table is here: United States' nuclear testing series.
The detonations [note 1] in the United States' Touchstone series are listed below:
|Name[note 2]||Date time (UT)||Local time zone[note 3]||Location[note 4]||Elevation + height[note 5]||Delivery[note 6]||Purpose[note 7]||Device[note 8]||Yield[note 9]||Venting[note 10]||References||Notes|
|Borate||23 October 1987 16:00:00.09||PST (-8 hrs)
||NTS Area U2ge||1,294 m (4,245 ft) - 542.5 m (1,780 ft)||ug shaft||weapons development||38 kt||I-131 venting detected, 0|||
|Waco||1 December 1987 16:00:30.09||PST (-8 hrs)
||NTS Area U3lu||1,176 m (3,858 ft) - 182.9 m (600 ft)||ug shaft||weapons development||less than 20 kt|||
|Mission Cyber||2 December 1987 16:00:00.084||PST (-8 hrs)
||NTS Area U12p.02||1,926 m (6,319 ft) - 270.6 m (888 ft)||ug tunnel||weapon effect||2 kt|||
|Kernville||15 February 1988 18:00:10.089||PST (-8 hrs)
||NTS Area U20ar||1,899 m (6,230 ft) - 541.6 m (1,777 ft)||ug shaft||weapons development||60 kt|||
|Abilene||7 April 1988 17:00:15.078||PST (-8 hrs)
||NTS Area U3mn||1,187 m (3,894 ft) - 245.06 m (804.0 ft)||ug shaft||weapons development||2 kt|||
|Schellbourne||13 May 1988 15:00:35.108||PST (-8 hrs)
||NTS Area U2gf||1,268 m (4,160 ft) - 463 m (1,519 ft)||ug shaft||weapons development||16 kt||Venting detected, 22 Ci (810 GBq)|||
|Laredo||21 May 1988 22:00:30.14||PST (-8 hrs)
||NTS Area U3mh||1,220 m (4,000 ft) - 351.4 m (1,153 ft)||ug shaft||weapons development||3.5 kt|||
|Comstock||2 June 1988 13:00:00.088||PST (-8 hrs)
||NTS Area U20ay||1,960 m (6,430 ft) - 620.3 m (2,035 ft)||ug shaft||weapons development||80 kt||Venting detected|||
|Nightingale - 2 (with Rhyolite)||22 June 1988 14:00:00.079||PST (-8 hrs)
||NTS Area U2ey||1,309 m (4,295 ft) - 237.7 m (780 ft)||ug shaft||safety experiment||less than 150 kt||||Simultaneous, separate holes.|
|Rhyolite - 1 (with Nightengale)||22 June 1988 14:00:00.079||PST (-8 hrs)
||NTS Area U2ey||1,309 m (4,295 ft) - 207.3 m (680 ft)||ug shaft||weapons development||less than 150 kt||||Simultaneous, separate holes.|
|Alamo||7 July 1988 15:00:35.07||PST (-8 hrs)
||NTS Area U19au||1,964 m (6,444 ft) - 622.1 m (2,041 ft)||ug shaft||weapons development||150 kt|||
|Kearsarge||17 August 1988 17:00:00.095||PST (-8 hrs)
||NTS Area U19ax||2,102 m (6,896 ft) - 615.7 m (2,020 ft)||ug shaft||weapons development||140 kt||||The American part of the Joint Verification Experiment.|
|Harlingen - 1||23 August 1988 18:00:30.08||PST (-8 hrs)
||NTS Area U6g||1,175 m (3,855 ft) - 289.6 m (950 ft)||ug shaft||weapons development||2 kt||||Simultaneous, separate holes.|
|Harlingen - 2||23 August 1988 18:00:30.08||PST (-8 hrs)
||NTS Area U6h||1,175 m (3,855 ft) +||ug shaft||weapons development||less than 20 kt||||Simultaneous, separate holes.|
|Bullfrog||30 August 1988 18:00:00.089||PST (-8 hrs)
||NTS Area U4au||1,236 m (4,055 ft) - 489.2 m (1,605 ft)||ug shaft||weapons development||33 kt||Venting detected, 4 Ci (150 GBq)|||
- A bomb test may be a salvo test, defined as two or more explosions "where a period of time between successive individual explosions does not exceed 5 seconds and where the burial points of all explosive devices can be connected by segments of straight lines, each of them connecting two burial points and does not exceed 40 kilometers in length". Mikhailov, V. N., Editor in Chief. Catalog of World Wide Nuclear Testing. Begell-Atom, LLC.
- The US, France and Great Britain have code-named their test events, while the USSR and China have not, and therefore have only test numbers (with some exceptions - Soviet peaceful explosions were named). Word translations into English in parentheses unless the name is a proper noun. A dash followed by a number indicates a member of a salvo event. The US also sometimes named the individual explosions in such a salvo test, which results in "name1 - 1(with name2)". If test is canceled or aborted, then the row data like date and location discloses the intended plans, where known.
- To convert the UT time into standard local, add the number of hours in parentheses to the UT time; for local daylight savings time, add one additional hour. If the result is less than 00:00, add 24 hours and subtract 1 from the day; if it's greater than or equal to 24:00, subtract 24 hours and add 1 to the day.
- Rough place name and a Latitude/Longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area.
- Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or subtracted by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, Plumbbob/John. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together.
- Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge are all disallowed by the Partial Nuclear Test Ban Treaty. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use.
- Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down.
- Designations for test items where known, "?" indicates some uncertainty about the preceeding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed.
- Estimated energy yield in tonnes, kilotonnes, and megatonnes (all metric units).
- Emissions to atmosphere, where known. The measured species is only iodine-131 if mentioned, otherwise it is all species. No entry means unknown, probably none if underground and everything if not; otherwise notation for whether measured on the site only or off the site, where known, and the measured amount of radiation released.
- Yang, Xiaoping; North, Robert; Romney, Carl (August 2000), CMR Nuclear Explosion Database (Revision 3), SMDC Monitoring Research
- Hechanova, Anthony E.; O'Donnell, James E. (1998-09-25), Estimates of yield for nuclear tests impacting the groundwater at the Nevada Test Site, Nuclear Science and Technology Division
- Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, Chapter 2, National Cancer Institute, 1997, retrieved 2014-01-05
- Radiological Effluents Released from U.S. Continental Tests 1961 Through 1992 (DOE/NV-317 Rev. 1), DOE Nevada Operations Office, retrieved 2013-10-31
- Official list of underground nuclear explosions, Sandia National Laboratories, 1994-07-01, retrieved 2013-12-18
- United States Nuclear Tests: July 1945 through September 1992 (DOE/NV-209 REV15), Las Vegas, NV: Department of Energy, Nevada Operations Office, 2000-12-01, retrieved 2013-12-18